[c-nsp] mls qos trust dscp on 7600 port-channel breaks IS-IS?

[Dmitry Valdov]

It might be a control-plane policy too.


On Wed, 10 Aug 2011, Blake Dunlap wrote:

> You're leaving out what your service policy looks like, which is where my
> hunch says the problem lies.
>
> On Wed, Aug 10, 2011 at 13:28, Jared Gillis <jared.a.gillis at gmail.com>wrote:
>
>> Hi all,
>>
>> I just ran into an unusual problem when deploying some QoS onto a 7606 in
>> my network. I was configuring all ports to trust DSCP input, and after
>> applying the command to all the physical ports, I went to apply it to my the
>> port-channels. Shortly after I did, IS-IS went down (timeout) on the L3
>> links across those port-channels. IS-IS came back when I removed the trust
>> DSCP command. I've done some searching around and can't find any reference
>> to this feature/bug/wtf anywhere. Does anyone have any knowledge about why
>> this would happen?
>>
>> Here's my PO config:
>> interface Port-channel1
>>  switchport
>>  switchport trunk encapsulation dot1q
>>  switchport trunk allowed vlan 200
>>  switchport mode trunk
>>  mtu 9216
>>  load-interval 30
>>  service-policy input SONIC-DEFAULT-QOS
>>
>> And the command I entered was "mls qos trust dscp".
>>
>> Thanks
>>
>> -Jared
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-- 
Dmitry Valdov
CCIE #15379 (R&S and SP)